Standard Test Method for Total Evaporable Moisture Content of Aggregate by Drying

SIGNIFICANCE AND USE
This test method is sufficiently accurate for usual purposes, such as adjusting batch quantities of ingredients for concrete. It will generally measure the moisture in the test sample more reliably than the sample can be made to represent the aggregate supply. In cases where the aggregate itself is altered by heat, or where more refined measurement is required, the test should be conducted using a ventilated, controlled temperature oven.
Large particles of coarse aggregate, especially those larger than 50 mm (2 in.), will require greater time for the moisture to travel from the interior of the particle to the surface. The user of this test method should determine by trial if rapid drying methods provide sufficient accuracy for the intended use when drying large size particles.
SCOPE
1.1 This test method covers the determination of the percentage of evaporable moisture in a sample of aggregate by drying, both surface moisture and moisture in the pores of the aggregate. Some aggregate may contain water that is chemically combined with the minerals in the aggregate. Such water is not evaporable and is not included in the percentage determined by this test method.  
1.2 The values stated in SI units are to be regarded as the standard. The values stated in parentheses are provided for information only.  
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. For specific precautionary statements, see 5.3.1, 7.2.1, and 7.3.1.

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Publication Date
31-Jan-2004
Drafting Committee
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ASTM C566-97(2004) - Standard Test Method for Total Evaporable Moisture Content of Aggregate by Drying
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: C566 − 97(Reapproved 2004)
Standard Test Method for
Total Evaporable Moisture Content of Aggregate by Drying
This standard is issued under the fixed designation C566; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope 2.2 Other Document:
National Research Council Report SHRP-P-619
1.1 This test method covers the determination of the per-
centage of evaporable moisture in a sample of aggregate by
3. Terminology
drying both surface moisture and moisture in the pores of the
aggregate. Some aggregate may contain water that is chemi- 3.1 Definitions:
cally combined with the minerals in the aggregate. Such water
3.1.1 For definitions of terms used in this test method, refer
is not evaporable and is not included in the percentage to Terminology C125.
determined by this test method.
4. Significance and Use
1.2 The values stated in SI units are to be regarded as the
standard. The values stated in parentheses are provided for
4.1 This test method is sufficiently accurate for usual
information only.
purposes, such as adjusting batch quantities of ingredients for
concrete. It will generally measure the moisture in the test
1.3 This standard does not purport to address all of the
samplemorereliablythanthesamplecanbemadetorepresent
safety concerns, if any, associated with its use. It is the
the aggregate supply. In cases where the aggregate itself is
responsibility of the user of this standard to establish appro-
altered by heat, or where more refined measurement is
priate safety and health practices and determine the applica-
required, the test should be conducted using a ventilated,
bility of regulatory limitations prior to use. For specific
controlled temperature oven.
precautionary statements, see 5.3.1, 7.2.1, and 7.3.1.
4.2 Large particles of coarse aggregate, especially those
2. Referenced Documents
larger than 50 mm (2 in.), will require greater time for the
2.1 ASTM Standards:
moisture to travel from the interior of the particle to the
C29/C29MTest Method for Bulk Density (“Unit Weight”)
surface. The user of this test method should determine by trial
and Voids in Aggregate
if rapid drying methods provide sufficient accuracy for the
C125Terminology Relating to Concrete and Concrete Ag-
intended use when drying large size particles.
gregates
C127Test Method for Density, Relative Density (Specific
5. Apparatus
Gravity), and Absorption of Coarse Aggregate
5.1 Balance—A balance or scale accurate, readable, and
C128Test Method for Density, Relative Density (Specific
sensitivetowithin0.1%ofthetestloadatanypointwithinthe
Gravity), and Absorption of Fine Aggregate
range of use.Within any interval equal to 10% of the capacity
C670Practice for Preparing Precision and Bias Statements
of the balance or scale used to determine mass, the load
for Test Methods for Construction Materials
indication shall be accurate within 0.1% of the difference in
D75Practice for Sampling Aggregates
masses.
E11Specification forWovenWireTest Sieve Cloth andTest
Sieves 5.2 Source of Heat—Aventilated oven capable of maintain-
ing the temperature surrounding the sample at 110 6 5°C (230
6 9°F).Where close control of the temperature is not required
This test method is under the jurisdiction of ASTM Committee C09 on
Concrete and ConcreteAggregatesand is the direct responsibility of Subcommittee
(see4.1),othersuitablesourcesofheatmaybeused,suchasan
C09.20 on Normal Weight Aggregates.
electric or gas hot plate, electric heat lamps, or a ventilated
Current edition approved February 1, 2004. Published March 2004. Originally
microwave oven.
approved in 1965. Last previous edition approved in 1997 as C566–97. DOI:
10.1520/C0566-97R04.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on Available from the National Research Council, 2101 Constitution Ave., N.W.,
the ASTM website. Washington, DC 20418.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
C566 − 97 (2004)
5.3 Sample Container—Acontainernotaffectedbytheheat, without losing any of the sample. Ignite the remaining alcohol
of sufficient volume to contain the sample without danger of and allow it to burn off during drying over the hot plate.
spilling, and of such shape that the depth of sample will not
7.3.1 Warning—Exercise care to control the ignition op-
exceed one fifth of the least lateral dimension.
eration to prevent injury or damage from the burning alcohol.
5.3.1 Precaution—When a microwave oven is used, the
7.4 The sample is thoroughly dry when further heating
container shall be nonmetallic.
causes,orwouldcause,lessthan0.1%additionallossinmass.
NOTE 1—Except for testing large samples, an ordinary frying pan is
7.5 Determine the mass of the dried sample to the nearest
suitable for use with a hot plate, or any shallow flat-bottomed metal pan
is suitable with heat lamps or oven. Note the precaution in 5.3.1. 0.1%afterithascooledsufficientlynottodamagethebalance.
5.4 Stirrer—A metal spoon or spatula of convenient size.
8. Calculation
6. Sampling
8.1 Calculate total evaporable moisture content as follows:
6.1 Sample in accordance with Practice D75, except for the
p 5100 W 2 D /D (1)
~ !
sample size.
6.2 Secure a sample of the aggregate representative of the
where:
moisture content in the supply being tested and having a mass
p = total evaporable moisture content of sample, percent,
not less than the amount listed in Table 1. Protect the samp
...

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